The lorenzinian ampullae of Polyodon spathula

  title={The lorenzinian ampullae of Polyodon spathula},
  author={J{\o}rgen M{\o}rup J{\o}rgensen and Ake Flock and Jan Wers{\"a}ll},
  journal={Zeitschrift f{\"u}r Zellforschung und Mikroskopische Anatomie},
SummaryLight and electron microscopic observations on the ampullary organs of Polyodon spathula (Chondrostei, Osteichthyes) reveal a sensory epithelium similar to that found in the Lorenzinian ampulla, an electroreceptor found in marine Elasmobranchs.The sensory cells have a very small luminal part provided with a cilium. They are innervated by many nerve endings. Each nerve fibre apparently makes synaptic contact with several sensory cells. The synaptic structure in the sensory cell is… 
Ultrastructure of the ampullary electroreceptors in lungfish and brachiopterygii
Electron microscopy shows that the electroreceptors of Protopterus dolloi (Dipnoi) and Calamoichthys calabaricus (Brachiopterygii) are very similar to the known ampullary electroreception of other primitive fish groups, but with one difference: at the apical surface of the receptor cells, instead of a kinocilium, a club-shaped protrusion is found.
On the ampullary organs of the South-American paddle-fish Sorubim lima (Siluroidea, Pimelodidae)
SummaryAmpullary organs were found in the epidermis of the paddle-fish Sorubim lima; they are distributed all over the skin surface of the fish but are particularly densely grouped in the head region
Structural Characteristics and Development of Ampullary Organs in Acipenser naccarii
It was observed that, when A. naccarii begins to feed actively, the ultrastructural characteristics of ampullary organs already correspond to those of adult animals, and these organs may, therefore, be functional and, together with taste buds, facilitate food search after exhaustion of yolk sac food reserves.
Larval electroreceptors in the epidermis of mormyrid fish: I. Tuberous organs of type A and B
Two types of larval electroreceptors, type A and B, are described in the epidermis of the head of larvae of three mormyrid species, Campylomormyrus cassaicus, Mormyrus rume proboscirostris and Pollimyrus isidori, bred in captivity, and the functional role of two tuberous electroreceptor types is examined.
Ampullary electroreceptors in the sturgeonScaphirhynchus platorynchus (rafinesque)
The ampullary organs of chondrostean fishes are electroreceptors, similar to those obtained with elasmobranch ampullae of Lorenzini and suggest that a similar mode of operation is present.
Morphology of Electroreceptive Sensory Organs
The morphology of electroreceptive organs in lampreys and their larvae, different fishes, aquatic amphibians, and monotreme mammals is described and only afferent nerve endings have been identified.
End buds: non-ampullary electroreceptors in adult lampreys
Experimental anatomical and physiological studies reported here demonstrate that the epidermal end buds are the electroreceptors of adult lampreys, indicating that the low-frequency sensitive electrosensory system of lampreys is homologous with those of non-teleost fishes and amphibians.
Adaptation of the Rostral Ampullary Electrosense for Plankton Feeding by the Paddlefish
Direct innervation of the tectum from the DON is unique to the paddlefish and may reflect dominance of the electrosensory system in tectal orientation, a mechanism essential for prey localization and capture.
The Paddlefish Rostrum as an Electrosensory Organ: A Novel Adaptation for Plankton Feeding
Feeding experiments with juvenile fish demonstrate that paddlefish detect and capture individual daphnia when all sensory modalities except the electrosense have been blocked, indicating an entirely new interpretation for the function of the paddle, that of an electrical antenna for detecting the electric fields of plankton.
Digestive and feeding characteristics of the chondrosteans
The chondrosteans are principally carnivores throughout their life history, and composition of the adult digestive enzyme complement is consistent with the carnivorous habits with proteases dominating and only low levels of carbohydrates activity.


Organization of ampullary electric receptors in Gymnotidae (Pisces)
The fine structure of the receptors in one species (Eigenmannia virescens) is described in detail, and the evolutionary relationships to different receptors of the vertebrate acoustic-lateralis system are discussed.
Special cutaneous receptor organs of fish: III. The ampullary organs of Eigenmannia
Ampullary receptor organs of the South American weakly electric gymnotid fish Eigenmannia virescens are compared to tuberous receptor organs found in the same species, and the functional significance of the fine structure observed in these cells is discussed.
Special cutaneous receptor organs of fish: IV. Ampullary organs of the nonelectric catfish, Kryptopterus
Structural characteristics of the ampullary organs of Kryptopterus make them especially suitable for electrophysiological studies.
The fine structure of ampullary electric receptors in Amiurus
  • A. M. Mullinger
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1964
The small pit-organs of Amiurus have been included in the group of ampullary lateral-line organs and are thought to be electric receptors and not mechano-receptors; thus they can be distinguished from all other types of acoustico-lateralis organs of vertebrates.
The function of the ampullae of Lorenzini, with some observations on the effect of temperature on sensory rhythms
The recognition of the morphological and developmental relationship of the vertebrate auditory organ and the lateral-line system of fishes and aquatic Amphibia rests on the foundation of a large
Special cutaneous receptor organs of fish: The tuberous organs of Eigenmannia
The special cutaneous receptor organs of the fresh water weakly electric fish have previously been proposed to be electroreceptors and the functional implications of some of the ultrastructural observations are discussed.
The bundle of sensory hairs protruding from the top of each receptor cell in the vestibular and lateral line organs in the teleost fish (burbot) Lota vulgaris is composed of a number of stereocilia